Abstract：Based on the outcrop observation and laboratory analysis,sedimentary facies and environment of the Mesoproterozoic Bingmagou formation are discussed using the methods of sedimentology,stratigraphy,sedimentary geochemistry. And three sub-facies( fan-plain,fan-front,front fan and some microfacies) are identified. It is a typical fan-delta. The research can provide a new evidence for new study of sedimentary evolution of the mesoproterozoic tectonic on the North China Craton.

Keyword：Yichuan area;Mesoproterozoic Bingmagou formation;sedimentary characteristic;sedimentary environment;